A Text-Book of Botany
A Text-Book of Botany
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In our eReader you can find the full English version of the book. Read A Text-Book of Botany Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book A Text-Book of Botany
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Cell walls are formed between the eight nuclei of this eight- celled pro-embryo. The cells form two tiers, those of the upper tier being in open communication with the cavity of the ovum. The four upper cells then undergo another division, and this is followed by a similar division of the four lower cells.
The PRO-EMBRYO thus consists of four tiers each containing four cells, the cells of Digitized by Google 484 BOTANY the upper tier being continuous with the remaining portion of the ovum. In t...he further development of the three lower tiers the middle tier elongates to form the susPENSOB, pushing the terminal tier from which the embryo will arise into the tissue of the prothallium or endosperm ; the cells of the latter are filled with nutritive reserve material.
In other genera a separation of the four rows of cells takes place, and each bears a young embryo. As a rule, however, only a single embryo continues its develop- ment in each macrospore although several archegonia may have been fertilised.
What to read after A Text-Book of Botany?
You can find similar books in the "Read Also" column, or choose other free books by Eduard Strasburger, Heinrich Schenck, Fritz Noll, George Karsten to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Cell walls are formed between the eight nuclei of this eight- celled pro-embryo. The cells form two tiers, those of the upper tier being in open communication with the cavity of the ovum. The four upper cells then undergo another division, and this is followed by a similar division of the four lower cells.
The PRO-EMBRYO thus consists of four tiers each containing four cells, the cells of Digitized by Google 484 BOTANY the upper tier being continuous with the remaining portion of the ovum. In t...he further development of the three lower tiers the middle tier elongates to form the susPENSOB, pushing the terminal tier from which the embryo will arise into the tissue of the prothallium or endosperm ; the cells of the latter are filled with nutritive reserve material.
In other genera a separation of the four rows of cells takes place, and each bears a young embryo. As a rule, however, only a single embryo continues its develop- ment in each macrospore although several archegonia may have been fertilised.
What to read after A Text-Book of Botany?
You can find similar books in the "Read Also" column, or choose other free books by Eduard Strasburger, Heinrich Schenck, Fritz Noll, George Karsten to read onlineMoreLess
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